Dodge Van tow vehicle ??

i towed a 32ft travel trailer no prob with a maxi van 3/4 ton. 360 minimum required.
I was thinking the same thing on the engine. Right now it has the original 318 which actually surprised me to no end that such a big vehicle would have a 318...wow

But I have a 440 setup out of a 77 Ramcharger so, it seems pretty natural what to do :)